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References:
[1] Erdős P.: Graph theory and probability II. Canad. J. Math. 13 (1961), 346-352. MR 0120168
[2] Greenwood R. E., Gleason A. M.: Combinatorial relations and chromatic graphs. Canad. J. Math. 7 (1955), 1-7. MR 0067467 | Zbl 0064.17901
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